d12: Clarify character image sprite/cg usage
d12: Clarify character image sprite/cg usage

erengy/vndb,christian-roggia/vndb,morkt/vndb,morkt/vndb,erengy/vndb,christian-roggia/vndb,morkt/vndb,christian-roggia/vndb,erengy/vndb,morkt/vndb,morkt/vndb